Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc58b7f9487b4e82…

MALICIOUS

PDF

75.7 KB Created: 2021-09-09 11:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1a24f60a29580b8bdbd25b777d00e845 SHA-1: 94820a340fd152588f1257c1ab9c806991058015 SHA-256: cc58b7f9487b4e828f7eaacee1c7045efca551a1ffc167eb93a17ed94c6ae981
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Several heuristics indicate the PDF is part of a link farm, with many links pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute further malicious files or redirect users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8530

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://fundreamz.com/ckfinder/userfiles/files/68437440640.pdf In PDF document text
    • http://faurau.com/luodan/images/userfiles/file/tibuxilemurigaratazafilek.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/mevewisuf.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/30324055728.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/pijosobidatizisub.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/wopodirosojebimana.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161354eab33ce8---botezexepifuzar.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210904_181048.pdfIn PDF document text
    • http://webs123.com/userfiles/file/fogetat.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/161351190651ab---ruzejej.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/057cd20e218a4a8836b4f5da53bb8279/68162347785.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/janenozazofatir.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a46ade85a---52631962368.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/e453ca72cf0accb30501f585c161c2ca/96249281719.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/rewebesiginivekezejev.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/57702629601.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/gobuve.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/34387307700.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613414d3e854f---43237747972.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/68117019326.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/lanalawagoxupi.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394e0128466---10226077226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=percy+jackson+book+5+read+onlinePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 17512 bytes
SHA-256: 8ef16f04cfe5db88c9af50a151f6a1f9d26ce185b57098f14284003dbcd7b29a

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